In this Issue:
VEGETABLE NEWS
Vegetable Insect Pest Update
BERRY NEWS
Blueberry IPM School in Beautiful Bayfield
APPLE NEWS
| Vol 4 No. 10 | August 10, 2007 |
Vegetable Insect Pest Update
Eric Burkness & Bill Hutchison, Dept. of Entomology, St. Paul, Minn.
Cabbage looper (CL) populations have remained high throughout the season. This week in Rosemount (Dakota Co.) 50% of plants were infested with CL larvae. Larval sizes ranged from small to large; however, we did not detect any CL eggs.
Potato leafhopper (PLH) populations in snap bean in the Rosemount area appear to be on the decline. This week sweep samples were at 0.1 PLH/sweep. However, there have been infestations of soybean aphid detected in snap beans that have led to the transmission of cucumber mosaic virus (CMV). Because symptoms of CMV (leaf puckering and yellowing) can look similar to PLH damage, you should make sure to verify that you have treatable populations of PLH associated with any foliar symptoms before making PLH treatment decisions. Currently there are no treatment options to prevent CMV transmission. For more information on CMV, see the August 3rd web only alert article, at http://www.vegedge.umn.edu/MNFruit&VegNews/Vol4/802SB.htm.
The 2nd flight of European corn borer (ECB) is underway across the state. Last week trap catch in several locations increased significantly (http://www.vegedge.umn.edu/2007/MNlist.htm). The blacklight trap in Steele Co. had the high one night trap catch of >400 on August 2nd. This should indicate the peak of the 2nd flight of bivoltine ECB and could lead to significant egg lay in susceptible sweet corn (silk stage). Corn earworm (CEW) trap catch in wire mesh pheromone traps across southern MN have also increased significantly (see graph, below). All locations have increased to >5 CEW moths/night which we are considering a conservative threshold for susceptible sweet corn at the silk stage (see the web only alert article at http://www.vegedge.umn.edu/MNFruit&VegNews/Vol4/802CEW.htm). The high one night trap catch of 193 moths on August 5th was recorded at the Blue Earth location. Progress of CEW trap catch can be viewed on the VegEdge website at http://www.vegedge.umn.edu/2007/CEW.htm.
ACKNOWLEDGEMENTS
Co-Editors: Bill Hutchison (hutch002@umn.edu), Department of Entomology, University of Minnesota, Jeanne Ciborowski, Minnesota Department of Agriculture, Ag. Resources Management and Development Division, and Suzanne Wold-Burkness (woldx018@umn.edu), Department of Entomology, University of Minnesota
The Newsletter is published weekly from May through August, cooperatively, by the Minnesota Department of Agriculture (MDA) and the University of Minnesota (U of MN). Reports are posted on the U of MN and MDA web sites on Fridays. If you have suggestions and/or comments, please send your contributions by 4 p.m., Wednesday to Jeanne Ciborowski, 651-201-6217, jeanne.ciborowski@state.mn.us , MDA, 625 Robert St. North, St. Paul, MN 55155. You can access the Newsletter at the U of MN web site in htm format at: www.vegedge.umn.edu/MNFruit&VegNews/mnindex.htm and at the MDA web site in pdf format at: www.mda.state.mn.us/plants/pestmanagement/ipm/ipmnews.htm
Partial funding for this publication is provided through partnership agreements with the Minnesota Fruit and Vegetable Growers Association (MFVGA) and the United States Department of Agriculture – Risk Management Agency (RMA). These institutions are equal opportunity providers.
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Reference to products in this publication is not intended to be an endorsement to the exclusion of others which may have similar uses. Any person using products listed in this publication assumes full responsibility for their use in accordance with current manufacturer directions.
Last Revised July, 2007 by woldx018@umn.edu
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